spring整合atomikos实现分布式事务

前言

Atomikos 是一个为Java平台提供增值服务的并且开源类事务管理器，主要用于处理跨数据库事务，比如某个指令在A库和B库都有写操作，业务上要求A库和B库的写操作要具有原子性，这时候就可以用到atomikos。笔者这里整合了一个spring和atomikos的demo,并且通过案例演示说明atomikos的作用。

准备工作

开发工具：idea

数据库：mysql , oracle

正文

源码地址：github.com/qw870602/at…

演示原理：通过在两个库的写操作之间人为制造异常来观察数据库是否回滚

演示步骤：1.正常写操作，观察数据库值的变化情况

2.在写操作语句之间制造异常，观察数据库值的变化情况

项目结构

从web.xml中可以知道，容器只加载了appliactionContext.xml，剩下的配置文件除了database.properties外都是无用文件，所以大家如果要在项目中配置的话，仅需要把appliactionContext.xml中关于atomikos的部分新增到自己项目中就OK了

appliactionContext.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans

        xmlns="http://www.springframework.org/schema/beans"

        xmlns:tx="http://www.springframework.org/schema/tx"

        xmlns:p="http://www.springframework.org/schema/p"

        xmlns:aop="http://www.springframework.org/schema/aop"

        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

        xmlns:mvc="http://www.springframework.org/schema/mvc"

        xmlns:context="http://www.springframework.org/schema/context"

        xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

    http://www.springframework.org/schema/tx

    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

    http://www.springframework.org/schema/aop

    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context-3.0.xsd

    http://www.springframework.org/schema/mvc

    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!-- 引入数据源信息的properties属性文件 -->

    <context:property-placeholder location="classpath:database.properties" />

    <!-- XA方式 -->

    <!-- MYSQL数据库配置 -->

    <bean id="mysqlDataSource" class="com.atomikos.jdbc.AtomikosDataSourceBean" destroy-method="close">

        <property name="uniqueResourceName" value="dataSource1"/>

        <property name="xaDataSourceClassName" value="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource"/>

        <property name="xaProperties">

            <props>

                <prop key="URL">${mysql.qa.db.url}</prop>

                <prop key="user">${mysql.qa.db.user}</prop>

                <prop key="password">${mysql.qa.db.password}</prop>

            </props>

        </property>

        <property name="minPoolSize" value="10" />

        <property name="maxPoolSize" value="100" />

        <property name="borrowConnectionTimeout" value="30" />

        <property name="maintenanceInterval" value="60" />

    </bean>

    <!-- ORACLE数据库配置 -->

    <bean id="oracleDataSource" class="com.atomikos.jdbc.AtomikosDataSourceBean" destroy-method="close">

        <property name="uniqueResourceName" value="dataSource2"/>

        <property name="xaDataSourceClassName" value="oracle.jdbc.xa.client.OracleXADataSource" />

        <property name="xaProperties">

            <props>

                <prop key="URL">${oracle.qa.db.url}</prop>

                <prop key="user">${oracle.qa.db.user}</prop>

                <prop key="password">${oracle.qa.db.password}</prop>

            </props>

        </property>

        <property name="minPoolSize" value="10" />

        <property name="maxPoolSize" value="100" />

        <property name="borrowConnectionTimeout" value="30" />

        <property name="maintenanceInterval" value="60" />

    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

        <!--<property name="configLocation" value="classpath:mybatis-config-mysql.xml" />-->

        <property name="dataSource" ref="mysqlDataSource" />

        <property name="mapperLocations" >

            <list>

                <value>classpath*:/dao/*.xml</value>

            </list>

        </property>

    </bean>

    <bean id="sqlSessionFactoryOracle" class="org.mybatis.spring.SqlSessionFactoryBean">

        <!--<property name="configLocation" value="classpath:mybatis-config.xml" />-->

        <property name="dataSource" ref="oracleDataSource" />

        <property name="mapperLocations" >

            <list>

                <value>classpath*:/daodev/*.xml</value>

            </list>

        </property>

    </bean>

    <!-- MyBatis为不同的mapper注入sqlSessionFactory -->

    <bean id="mysqlTransactionTestDao" class="org.mybatis.spring.mapper.MapperFactoryBean">

        <property name="sqlSessionFactory" ref="sqlSessionFactory" />

        <property name="mapperInterface" value="com.xy.dao.MysqlTransactionTestDao" />

    </bean>

    <bean id="transactionTestDao" class="org.mybatis.spring.mapper.MapperFactoryBean">

        <property name="sqlSessionFactory" ref="sqlSessionFactoryOracle" />

        <property name="mapperInterface" value="com.xy.dao.TransactionTestDao" />

    </bean>

    <!-- 分布式事务 -->

    <bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" init-method="init" destroy-method="close">

        <property name="forceShutdown" value="true"/>

    </bean>

    <bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp">

        <property name="transactionTimeout" value="300"/>

    </bean>

    <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">

        <property name="transactionManager" ref="atomikosTransactionManager"/>

        <property name="userTransaction" ref="atomikosUserTransaction"/>

    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <context:annotation-config/>

    <!--&lt;!&ndash; 自动扫描controller包下的所有类，如果@Controller注入为bean &ndash;&gt;-->

    <!--&lt;!&ndash;事务管理层&ndash;&gt;-->

    <context:component-scan base-package="com.xy" />

    <!-- 注册拦截器 -->

    <!--<mvc:interceptors>

        <bean class="com.springmybatis.system.interceptor.MyInterceptor" />

    </mvc:interceptors>-->

</beans>复制代码

适用JUnit4进行单元测试

package com.xy.controller;

import com.xy.daodev.TransactionTestService;

import org.junit.Test;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;

@ContextConfiguration(locations = {"classpath:applicationContext.xml"})

public class TransactionTestMain extends AbstractJUnit4SpringContextTests {

   @Autowired

 private TransactionTestService transactionTestService;

 /**

  * 在同一事务有多个数据源

  */

 @Test

 public void multipleDataSource2() {

  transactionTestService.updateMultipleDataSource("1","1", 100L,"1.6");

 }

}

业务实现，当前没有异常操作

@Service

public class TransactionTestServiceImpl implements TransactionTestService {

   @Autowired

 @Qualifier("mysqlTransactionTestDao")

 private MysqlTransactionTestDao mysqlTransactionTestDao;

 @Autowired

 @Qualifier("transactionTestDao")

 private TransactionTestDao transactionTestDao;

 /**

  * 在同一事务有多个数据源

  */

 @Override

 @Transactional

 public void updateMultipleDataSource(String deUserId, String inUserid, long money,String str) {

  // 账户1转出操作

  mysqlTransactionTestDao.decreaseMoney(deUserId, money);

    //Integer.parseInt(str);

  // 账户2转入操作

  transactionTestDao.increaseMoney(inUserid, money);

 }  

}

mysql模拟金额转出，oracle模拟金额转入

<update id="decreaseMoney" parameterType="java.util.Map">

    UPDATE fx1 SET amount=amount - #{1,jdbcType=BIGINT} WHERE id=#{0,jdbcType=VARCHAR}

</update><update id="increaseMoney">

    UPDATE fx1 SET amount=amount + #{1,jdbcType=BIGINT} WHERE id=#{0,jdbcType=VARCHAR}

</update>

mysql初始金额

oracle初始金额

执行正常操作

mysql当前金额

oracle当前金额

将被屏蔽的制造异常的代码打开

public void updateMultipleDataSource(String deUserId, String inUserid, long money,String str) {

 // 账户1转出操作

 mysqlTransactionTestDao.decreaseMoney(deUserId, money);

   Integer.parseInt("skg");

 // 账户2转入操作

 transactionTestDao.increaseMoney(inUserid, money);

}

发现mysql和oracle的当前金额都没有变化，说明事务回滚成功，查看日志

发现控制台打印出了异常信息，并且atomikos调用了rollback()方法，从日志也证实了回滚成功。

END

作者：胖子k
链接：https://juejin.im/post/5ce24d4ce51d45109b01b0f4